Form submission error: Expected Rate Of Return and Please enter a valid number.
This error occurs because this is a number field, so it expects an integer. Adding a "%" or anything other than a number is an invalid character.
If you want to change it to a text field to allow any value (including "%") then you can. You can also change the wording of the form description or add any additional fields.
To modify any of your forms go to your website Dashboard, go to Forms, then select the desired form. You have full control over all fields in your form. You can also change the confirmation message if you wish.